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Two members of a right-wing group caught on camera involved in a punch up in Sevenoaks turned out to be on the same side.
Dale Lutton, 27, from Northern Ireland, revealed that after swapping punches the two realised their mistake and shook hands.
But that didn't prevent Lutton, who was convicted of violent disorder during the fight in Sainsbury's car park, from receiving a jail sentence for his part in the incident.
Maidstone Crown Court heard how the rival gangs acted like "football hooligans"- during clashes in Marks and Spencer car park.
The incidents happened in April last year on a Sunday evening in Blighs Meadow and frightened families "going about their lawful business."
Prosecutor Patrick Dennis said: "This was a wholly unsavoury, unnecessary and unlawful incident. They were acting like football hooligans.
"One side was a right wing group called Generation Identity. On the other was a left wing group called Anti-Fa."
Lutton, from Portadown, Northern Ireland, and Deirdre McTucker, 43, from Dublin, Ireland, were convicted of violent disorder.
Lutton, of no fixed address, was jailed for 16 months after he was filmed joining in with the fighting as soon as it began, targeting one person in particular and throwing multiple punches at him.
McTucker, of no fixed address, was jailed for 12 months after being found guilty of violent disorder at a trial in September. She was filmed grabbing a woman by the hair before punching her repeatedly in the face.
Paul Carbine, 33, of Meadow Lane in Wickford, Essex, was sentenced to 12 months imprisonment after pleading guilty to violent disorder.
He was caught on camera throwing punches at various different members of the opposing group.
Sebastian Seccombe, 20, of Holwick Close in Consett, County Durham, was sentenced to 10 months in a young offender institution after pleading guilty to violent disorder.
He kicked a member of the opposing group in the stomach before aiming a flying kick at others who were fighting. The prosecutor told the court that Generation Identity had been holding a conference and initially planned to have it in London.
But when Anti-Fa were intending to attend to protest, the group then moved the conference to the Stag Theatre in Sevenoaks.
Mr Dennis said Anti-Fa found out about this and went to the town and the two groups clashed.
"Footage shows members of both groups engaging in hand to hand combat. There can be no doubt that ordinary members of the public were frightened by what they witnessed."
Det Sgt Dan Barker of Kent Police said: "The actions of these four people and others involved in fighting that day were completely unacceptable.
"Members of the public should be able to go about their daily business without having to witness such mindless acts of violence, as has been demonstrated by the sentences imposed by the judge in this case.
"All four now have plenty of time behind bars to consider whether the juvenile behaviour they displayed was really worth it."